kids their age. different schools, similar interests. both smart, popular, athletic. but they knew their families weren't like most others. robin, a senior, grew up in foster care. >> going from like foster home to foster home, i only grew up with my one brother. and that's like all i knew. >> reporter: jordan, a junior, was adopted, something her mom never hid. >> her telling me that i was adopted really wasn't that big of a deal really. i just wanted to know more about it. >> reporter: strangely enough, jordan joined the track team. something happened that sent her heart and robin's soaring. this past winter at a track meet of all places, one of the great mysteries about their childhoods was suddenly revealed. and their lives have been dramatically different ever since. jordan's teammate william was watching. >> i said, "go, jordan, go, jordan, go, jordan, go, jordan!" when they crossed the finish line, she turned around. i was like, yeah! that's not jordan. >> reporter: it was robin, a mixup he related to jordan.